Charles William Frost (30 November 1882 – 22 July 1964) was an Australian politician and diplomat. He served in the House of Representatives from 1929 to 1931 and 1934 to 1946, representing the Labor Party. He was a minister in the Chifley Government from 1941 to 1946, and later became Australian High Commissioner to Ceylon from 1947 to 1950.